kconfig: add CONFIG_MSI_NONBROKEN

Not all interrupt controllers have a working implementation of
message-signalled interrupts; in some cases, the guest may expect
MSI to work but it won't due to the buggy or lacking emulation.

In QEMU this is represented by the "msi_nonbroken" variable.  This
patch adds a new configuration symbol enabled whenever the binary
contains an interrupt controller that will set "msi_nonbroken".  We
can then use it to remove devices that cannot be possibly added
to the machine, because they require MSI.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/intc/Kconfig

@@ -12,12 +12,15 @@ config IOAPIC
 
 config ARM_GIC
     bool
+    select MSI_NONBROKEN
 
 config OPENPIC
     bool
+    select MSI_NONBROKEN
 
 config APIC
     bool
+    select MSI_NONBROKEN
 
 config ARM_GIC_KVM
     bool

hw/pci-host/Kconfig

@@ -49,3 +49,4 @@ config PCI_EXPRESS_XILINX
 config PCI_EXPRESS_DESIGNWARE
     bool
     select PCI_EXPRESS
+    select MSI_NONBROKEN

hw/pci/Kconfig

@@ -7,3 +7,9 @@ config PCI_EXPRESS
 
 config PCI_DEVICES
     bool
+
+config MSI_NONBROKEN
+    # selected by interrupt controllers that do not support MSI,
+    # or support it and have a good implementation. See commit
+    # 47d2b0f33c664533b8dbd5cb17faa8e6a01afe1f.
+    bool

hw/ppc/Kconfig

@@ -8,6 +8,7 @@ config PSERIES
     select VFIO if LINUX   # needed by spapr_pci_vfio.c
     select XICS_SPAPR
     select XIVE_SPAPR
+    select MSI_NONBROKEN
 
 config SPAPR_RNG
     bool

hw/riscv/Kconfig

@@ -6,6 +6,7 @@ config HART
 
 config SIFIVE
     bool
+    select MSI_NONBROKEN
 
 config SIFIVE_E
     bool

hw/s390x/Kconfig

@@ -9,3 +9,4 @@ config S390_CCW_VIRTIO
     select S390_FLIC
     select SCLPCONSOLE
     select VIRTIO_CCW
+    select MSI_NONBROKEN